B&B Electronics VFG3000 - Manual - Manual (Page 54)

W ORKING WITH M ODEMS V LINX F IELDBUS G ATEWAY M ANAGER U SER M ANUAL
P AGE 38
S
TATUS
M
EANING
CONNECTED The modem has established a connection. This state will
persist for only a short time, as the LCP negotiation
process will begin after a small delay.
NEG LCP The connection is negotiating LCP options. This process
decides on a set of link protocol settings that are
acceptable to both the client and the server.
AUTH The connection is performing the authentication process
to ensure that the appropriate user credentials are used.
NEG IPCP The connection is negotiating IPCP options. This process
decides on a set of network protocol settings that are
acceptable to both the client and the server.
UP The connection is active and IP data can be exchanged.
HANGING UP The modem is disconnecting. This state will exist for
only a short time before the modem returns to IDLE.
The signal strength values returned by GSM modems have the following meaning…
V
ALUE
S
IGNAL
S
TRENGTH
0 –113 dBm or less.
1 –111 dBm .
2-30 –109 dBm to –52 dBm in 2 dBm steps.
31 –51 dBm or greater.
99 Signal strength cannot be determined.
Cell phones typically interpret these values as follows when displaying signal strength…
V ALUE S TRENGTH N UMBER OF B ARS
5 or less. –103 dBm or less. One
6 thru 9. –101 dBm thru –95 dBm Two
10 thru 14. –93 dBm thru –85 dBm Three
15 or greater. –83 dBm or greater. Four
M ODEM I NITIALIZATION S EQUENCE
The interface needs the following settings configured in the modem:
• No echo
• Verbal result codes
• Normal carrier detect operation
• DTR override